Electrolyte solution for a lithium secondary battery and a lithium secondary battery including same

Patent metadata

Field	Value
Publication number	US-12412929-B2
Application number	US-202217990435-A
Country	US
Kind code	B2
Filing date	Nov 18, 2022
Priority date	Jun 10, 2022
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

An electrolyte for a lithium secondary battery can enhance lifetime and output characteristics in a high-capacity lithium secondary battery. The electrolyte for a lithium secondary battery includes a lithium salt, a solvent, and a functional additive. The functional additive includes 1-(3-((tert-butyldimethylsilyl)oxy)propyl)-5-(4-fluorophenyl)-1H-1,2,3-triazole-4-carbonitrile as a positive electrode film additive.

First claim

What is claimed is:

1. An electrolyte for a lithium secondary battery, the electrolyte comprising:
a lithium salt;
a solvent; and
a functional additive including 1-(3-((tert-butyldimethylsilyl)oxy)propyl)-5-(4-fluorophenyl)-1H-1,2,3-triazole-4-carbonitrile represented by the following formula as a positive electrode film additive:

2. The electrolyte of claim 1 , wherein the positive electrode film additive is in a range of 0.1-1.0 wt. %, based on a weight of the electrolyte.

3. The electrolyte of claim 1 , wherein the positive electrode film additive is in a range of 0.1-0.3 wt. %, based on a weight of the electrolyte.

4. The electrolyte of claim 1 , wherein the functional additive further comprises vinylene carbonate (VC) as a negative electrode film additive.

5. The electrolyte of claim 4 , wherein the vinylene carbonate (VC) is in a range of 0.5-3.0 wt. %, based on the weight of the electrolyte.

6. The electrolyte of claim 1 , wherein the lithium salt comprises LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiN(SO 2 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiB(C 6 H 5 ) 4 , Li(SO 2 F) 2 N, (LiFSI), (CF 3 SO 2 ) 2 NLi, or combinations thereof.

7. The electrolyte of claim 1 , wherein the solvent comprises a carbonate-based solvent, an ester-based solvent, an ether-based solvent, a ketone-based solvent, or combinations thereof.

8. A lithium secondary battery including an electrolyte comprising:
a lithium salt;
a solvent; and
a functional additive including 1-(3-((tert-butyldimethylsilyl)oxy)propyl)-5-(4-fluorophenyl)-1H-1,2,3-triazole-4-carbonitrile represented by the following formula as a positive electrode film additive:

9. The lithium secondary battery of claim 8 , further comprising:
a positive electrode containing a positive electrode active material including Ni, Co, and Mn;
a negative electrode containing a negative electrode active material including a carbon (C)-based material, a silicon (Si)-based material, or a combination thereof; and
a separator interposed between the positive electrode and the negative electrode.

10. The lithium secondary battery of claim 9 , wherein the positive electrode comprises 80 wt. % or more Ni.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Lee Yoon Sung
• Rhee Jun Ki
• Nam Hui Beom
• Kim Ko Eun
• Ban Sung Ho
• Oh Seung Min
• Kwak Sang Kyu
• Choi Nam Soon
• Hong Sung You
• Kim Hyeong Jun
• Jeong Seo Young
• Moon Hyeon Gyu
• Kim Min Pyeong

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/004

  Three solvents · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title